diff --git a/MdePkg/Include/IndustryStandard/Tls1.h b/MdePkg/Include/IndustryStandard/Tls1.h
index 9009291ee3..cccb6db7fb 100644
--- a/MdePkg/Include/IndustryStandard/Tls1.h
+++ b/MdePkg/Include/IndustryStandard/Tls1.h
@@ -3,7 +3,7 @@
 
   This file contains common TLS 1.0/1.1/1.2 definitions from RFC 2246/4346/5246
 
-  Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -87,6 +87,20 @@ typedef struct {
   UINT16                  Length;
 } TLS_RECORD_HEADER;
 
+#define TLS_RECORD_HEADER_LENGTH   5
+
+//
+// The length (in bytes) of the TLSPlaintext records payload MUST NOT exceed 2^14.
+// Refers to section 6.2 of RFC5246. 
+//
+#define TLS_PLAINTEXT_RECORD_MAX_PAYLOAD_LENGTH   16384
+
+//
+// The length (in bytes) of the TLSCiphertext records payload MUST NOT exceed 2^14 + 2048.
+// Refers to section 6.2 of RFC5246. 
+//
+#define TLS_CIPHERTEXT_RECORD_MAX_PAYLOAD_LENGTH   18432
+
 #pragma pack()
 
 #endif